in the new nbc poll, no change in florida, obama by one. romney up three since the debate. romney up two in ohio, trailing by six. >> you're talking about single digits, having picked sides as a result of the debate, and romney got the advantage there. so we see a slight closing in these tossup numbers in these three critical states. >> reporter: more pressure on the number two candidates, who face off tonight. for their debate here at center college, domestic and foreign policy, biden and ryan will be seated, which normally leads to a lower energy level. from danville, kentucky, steve handelsman. >> they also came out with a poll on the senate race, showing tightening there, too, huh? >> reporter: that's right. tim kaine at 47% now, just one point above george allen at 46%. just go back a week ago, which, again, was before the presidential debates, jim, and kaine was 49 over allen's 44. a five-point spread became a one-point spad. even in the case of these two guys, both super-well-known governors, that things that happen to the top of the ticket can ripple down to senate